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OFDM for Mobile Communications Systems. Efficient Modulations and Techniques

Формат:      Страниц 132
     мягкая обложка
Mutamed K.    
Книга по Требованию    
2261 руб
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It will focus on post-detection combining systems and study the effect of diversity, fading severity and sensitivity of channel correlation for the various signaling systems. It will study the performance of non-coherent OFDM modulations over generalized mobile radio fading channels with correlated branches, based on balance incomplete block design. Current cellular communications systems have adopted digital technology. This book describes diversity schemes in which signal processing at the receiver is combined, where it is possible to design systems in which the reliability/throughput far exceeds systems in use today. However, the major services they provide are limited to basic services, such as voice, and relatively low-bit-rate data. We are now in the 21st century, where the demands for a variety of wideband services such as high-speed Internet access and video/high-quality image transmission, will continue to increase. The third-generation mobile communication system based on wideband CDMA has been designed to support wideband services at data rates with the same quality as fixed networks.
Швабра для пола, с отжимом.
Швабра может использоваться для мытья пола, стен и окон. Пригодна для чистки ковров. Моющая губка - 27 см. Ручка - телескопическая, длина
331 руб
Раздел: Швабры и наборы
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Бумага чертежная (ватман) предназначена для всех видов чертежных и графических работ. Используется для работы карандашом, линером,
312 руб
Раздел: Прочее
Стул детский Ника "СТУ3" складной, мягкий (синий).
Особенности: - стул складной; - предназначен для детей от 3 до 7 лет; - металлический каркас; - на ножках стула установлены пластмассовые
518 руб
Раздел: Стульчики

Технология WiMax
Роуминг позволяет при передвижении абонента на скорости до 120 км/ч «бесшовно» переключаться между базовыми станциями (точно так же как это происходит в сетях сотовой связи). В мобильном WiMAX применяется Scalable OFDMA — масштабируемый OFDM-доступ и возможна работа как в условиях прямой видимости так в ее отсутствие. Для сетей Mobile WiMAX выделяются частотные диапазоны: 2,3–2,5; 2,5–2,7; 3,4–3,8 ГГц. На сегодняшний день в мире реализованы и успешно функционируют беспроводные широкополосные сети на основе Mobile WiMAX, в том числе первыми в России свои сети развернули компании «Скартел» — бренд Yo a (сети построены в Москве, Санкт-Петербурге, Уфе, Краснодаре, Сочи, Никарагуа) и Комстар O C (сеть в Москве). Конкурентами 802.16e являются все мобильные технологии третьего поколения 3G, например, EV-DO. И если стандарт IEEE 802.16d является протоколом операторского класса, то мобильный WiMAX ориентирован на конечных пользователей, и в данном случае он представляет собой альтернативу стандартам 802.11 a/b/g. Имея ноутбук или КПК со встроенным WiMAX модемом, и подключившись к сети, пользователь сможет постоянно оставаться на связи в любой точке города, где обеспечивается зона покрытия WiMAX сети.

The Analysis of the Critical Factors that Affect Consumers' Willingness. To Adopt 3G Mobile Communication Systems Книга по Требованию
Through the investigation from practical verification, this report is aiming at offering the 3G Industry and related Telecom Corporations and Operators in the field some referential information when establishing their marketing strategies, and on top of that, having a better understanding of the habitual practice and demand of consumers.
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Calculus of Communicating Systems Книга по Требованию Lambert M. S.
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Duty-Cycle Division Multiplexing (DCDM). A New Multiplexing Technique for Optical Fiber Communication Systems Книга по Требованию Ghafour A.M.
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Multi-Carrier DS-CDMA Mobile Systems. Receiver Design Книга по Требованию Ali J.
Secondly, the multi-path fading of mobile radio channels which highly degrades the system performance.
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Conception and Evaluation of Systems for Seamless Vertical Handover Fixed-mobile Convergence in TISPAN/3GPP IMS. Книга по Требованию
Mobility management over heterogeneous networks is a major requirement for FMC systems.
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Methodology for Systemic Creation of Services. A Case Study of Mobile Services Книга по Требованию
The proposed approach is illustrated with a case of mobile services, one of the technology-based services.
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The Case of the Mobile Payment Services Market in Finland The Emergence and Scope of Complex System/Service Innovation. Книга по Требованию Milla L.
Mainly this is done in the light of how the key industry actors have tried to create the market up until approximately autumn 2005.
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Adaptive MIMO Systems. Explorations for Indoor Wireless Communications Книга по Требованию Peerapong U.
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A Mobile Agents-based Intrusion Detection System for Voice over Internet Protocol MAIDS for VoIP. Книга по Требованию Christian C.
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Finally, an example resource management protocol which is a modified and scaled version of the Ricart-Agrawala algorithm implemented using the virtual ring structure is presented with the performance results.
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Pilot-Assisted OFDM Systems. Low-Complexity Algorithms for Optimised Channel Estimation and Detection Книга по Требованию Eugene G.
A family of reduced-complexity pilot-assisted estimators for the single and multiple-antenna OFDM configurations is described, emphasising optimal design and analytic performance evaluation.
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The proposed methods were applied to multicarrier code division multiple access (MC-CDMA. Reducing the PAPR can be regarded as an important issue to realize efficient and affordable communication services. This study proposes efficient PAPR reduction methods for OFDM signals by decreasing the possibility of peaks of the subcarriers signals to occur at the same time. However, OFDM poses high peak-to-average power ratio (PAPR) problem, as a consequence of independently modulated carriers, that causes degradation on the error performance of the system, low efficiency of the power amplifier, and increases the complexities of the system. Orthogonal frequency division multiplexing (OFDM) technology promises to be a key technique for achieving the high data capacity and spectral efficiency requirements for wireless communication systems of the near future. The achieved results confirm that the proposed methods are capable of reducing the PAPR significantly and, therefore, of improving error performance of the system.
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Buddy systems can promote social and emotional well-being and create a caring school environment where students feel cared for, experience a sense of belonging and inclusion, learn pro-social values and build resilience.
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A bidirectional SCM-ASK model for RoF communication system that incorporates optical mm-wave generation and wavelength reuse for uplink connection has been proposed in this work.
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